Chemicals found in coffee could be used to manufacture remedies for insomnia and heart disease, according to a group of scientists at Vanderbilt University. The scientists have focused on chlorogenic acids, and it is believed that these substances offset coffee's other stimulant ingredient, caffeine. Some of these influence the body's adenosine chemical, which controls the rate that nerves transmit nervous messages. While caffeine blocks the action of adenosine by causing the heart to pound, chlorogenic acid increases the levels of adenosine by preventing its re-absorption by the body.